Syrian Army fighters preparing themselves to shoot against Syrian Army positions in Aleppo, Syria, March 11.

By Louis Charbonneau, Reuters

UNITED NATIONS -- Iran, Syria and North Korea on Friday prevented the adoption of the first international treaty to regulate the $70 billion global conventional arms trade, complaining that it was flawed and failed to ban weapons sales to rebel groups.

To get around the blockade, British U.N. Ambassador Mark Lyall Grant sent the draft treaty to Secretary-General Ban Ki-moon and asked him on behalf of Mexico, Australia and a number of others to put it to a swift vote in the General Assembly.

U.N. diplomats said the 193-nation General Assembly could put the draft treaty to a vote as early as Tuesday.

The head of the U.S. delegation, Assistant Secretary of State Thomas Countryman, told a group of reporters, "We look forward to this treaty being adopted very soon by the United Nations General Assembly."

He declined to predict the result of a vote but said it would be a "substantial majority" in favor.

"A good, strong treaty has been blocked," said Britain's chief delegate, Joanne Adamson. "Most people in the world want regulation and those are the voices that need to be heard."

"This is success deferred," she added.

The point of an arms trade treaty is to set standards for all cross-border transfers of conventional weapons.

It would also create binding requirements for states to review all cross-border arms contracts to ensure arms will not be used in human rights abuses, terrorism or violations of humanitarian law.

NRA: Treaty threatens gun rightsArms control activists and human rights groups say a treaty is needed to halt the uncontrolled flow of arms and ammunition that they say fuels wars, atrocities and rights abuses.

"The world has been held hostage by three states," said Anna Macdonald, an arms control expert at humanitarian agency Oxfam. "We have known all along that the consensus process was deeply flawed and today we see it is actually dysfunctional."

"Countries such as Iran, Syria and DPRK (North Korea) should not be allowed to dictate to the rest of the world how the sale of weapons should be regulated," she added.

The National Rifle Association opposes the treaty and has vowed to fight to prevent its ratification if it reaches Washington. The NRA says the treaty would undermine domestic gun-ownership rights.

The American Bar Association, an attorneys' lobby group, has said that the treaty would not impact the right to bear arms.

Jim Watson / AFP - Getty Images

Demonstrators from Amnesty International call for a global arms treaty in a protest outside the White House, March 22.

The main reason the arms trade talks took place at all is that the United States - the world's biggest arms exporter - reversed U.S. policy on the issue after President Barack Obama was first elected and decided in 2009 to support an arms treaty.

Iranian President Mahmoud Ahmadinejad had told Iran's Press TV that Tehran supported the arms trade treaty. But Iranian U.N. Ambassador Mohammad Khazaee told the conference that he could not accept the treaty in its current form.

"It is a matter of deep regret that genuine efforts of many countries for a robust, balanced and non-discriminatory treaty were ignored.,” he said.

One of those flaws was its failure to ban sales of weapons to groups that commit "acts of aggression," ostensibly referring to rebel groups, he said. The current draft does not ban transfers to armed groups but says all arms transfers should be subjected to rigorous risk and human rights assessments first.

Syrian Ambassador Bashar Ja'afari echoed the Iranian concerns. "Unfortunately our national concerns were not taken into consideration," he said.

North Korea's delegate voiced similar complaints, suggesting it was a discriminatory treaty.

Russia and China made clear they would not have blocked it but voiced serious reservations about the text and its failure to get consensus.

A Russian delegate told the conference that Moscow would have to think hard about signing it if it were approved.

If adopted by the General Assembly, the pact will need to be signed and ratified by at least 50 states to enter into force.